Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 23: Precision spectroscopy II
A 23.5: Talk
Thursday, March 13, 2008, 15:00–15:15, 3C
X-Ray Transitions from Antiprotonic Noble Gases — Detlev Gotta1, •Khalid Rashid2, Burkhard Fricke3, Paul Indelicato4, and Leon Simon5 — 1Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germanny — 2Bahria University, E-8, Islamabad, Pakistan — 3Institut für Physik, Universität Kassel, D-34132 Kassel, Germany — 4Laboratoire Kastler Brossel, UPMC-Paris 6 ENS CNRS; Case 74, 4 Place Jussieu, F-75005 Paris, France — 5Laboratory for Particle Physics, Paul Scherer Institut, CH-5232 Villingen, Switzerland
The onset of antiprotonic X-ray transitions at high principal quantum numbers and the occurrence of electronic X-ray in antiprotonic argon krypton, and xenon is analysed with Multiconfiguration Dirac-Fock calculations. The shell by shell ionisation by Auger electron emission, characterised by appearance and disappearance of X-ray lines, is followed through the antiprotonic cascade by considering transition and binding energies of both the antiproton and remaining electrons. A number of additional lines in the X-ray spectra have been tentatively assigned to electronic transitions caused by electronic de-excitation after Auger emission during the antiprotonic cascade. A few lines remain unexplained so far or are not unambiguously assigned. The complexity of the electronic states cannot be resolved with semiconductor detectors. Hopefully, in future high resolution devices like crystal spectrometers and Auger electron spectroscopy at antiproton at GSI will resolve this complexity.